ADP1621ARMZ-R7

ADP1621 is a fixed-frequency, pulse-width modulation (PWM), current-mode, step-up converter controller. It drives an external n-channel MOSFET to convert the input voltage to a higher output voltage. It can also be used to drive flyback, SEPIC, and forward converter topologies, either isolated or no isolated. It eliminates the use of a current-sense power resistor by measuring the voltage drop across the on resistance of the n-channel MOSFET. This technique, allowed upto a maximum voltage of 30V at the switch node, maximizes efficiency and reduces cost. For switch-node voltages higher than 30V or for more accurate current limiting, the CS pin can be connected to a current-sense resistor in the source of the MOSFET. It is widely used in application such as APD bias, portable electronic equipment, isolated dc-to-dc converter, step-up/step-down dc-to-dc converter, LED driver for laptop computer and navigation system, LCD backlighting etc.

• 92% efficiency (no sense resistor required)
• ±1.0% initial accuracy, shutdown current is 10μA
• IC supply voltage range is 2.9V to 5.5V, power-input voltage as low as 1V
• Capable of high supply input voltage (5.5 V) with an external NPN or a resistor
• Lossless current sensing for switch-node voltage 30V
• External slope compensation with 1 resistor, synchronizable to external clock
• Current limit and thermal overload protection, VIN UVLO and 35mA shunt regulator
• Current-mode operation for excellent line and load transient responses
• Soft start in 2048 clock cycles, supported by ADIsimPower™ design tool
• Operating temperature is -40°C to +125°C, package style is 10-lead MSOP

บันทึก

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